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The Compression Test measures the speed that the CPU can compress blocks of data into smaller blocks of data without losing any of the original data. The result is reported in Kilobytes per Second. This test uses complex data structures and complex data manipulation techniques to perform a function that is very common in software applications, ranging from backup software to Email software. The compression test uses an Adaptive encoding algorithm based on a method described by from Ian H. Witten, Radford M. Neal, and John G. Cleary in an article called “Arithmetic Coding for Data Compression”. The system uses a model which maintains the probability of each symbol being the next encoded. It reports a compression rate of 363% for English text, which is slightly better than the classic Huffman method. This tests uses memory buffers totaling about 16kb per core.

OK the cpu compresses data to enable it to deal with less data. This assumes that it's faster to compress and deal with the compressed data than to deal with non compressed data. Does compression mean something like zipping a file or trunjating data that the processor does not need?

"cpu compression" is the wrong title. "file compression cpu test" would be more descriptive and accurate I think. to my knowledge, the i7 doesn't have compression instructions. this is done through software.
zipping a file is basically the same thing. except with this you time it.

Image CompressionI haven't been backing up my video collection, due to it's size (~1565GBs), because I didn't want to dedicate that much hard drive space to that task, but after looking at the compression options in TI, that could be reduced to ~898GBs, so that it would fit on a 1TB drive, with some room to spare. ...

File CompressionIn looking for a means to backup my movies volume (~750GB), prior to sending that hard drive in for RMA, I decided to see if I could place them on a smaller drive (500GB), first by using True Image's Cloning feature (I was hoping that it would be able to compress the files enough), which failed. ...

Performance & Maintenance

Files Compressionis it okay to compress files/folders?
is it advisable to do that on Program Files, maybe?